中空粒子を用いたER流体における粒子密度効果

概要

論文の詳細を見る
The relation between the densities of particles in ER fluids and the shear stress was investigated. Micro balloons used as particles, were dispersed in silicon oil which was used as the base fluid. Sample 4 containing particles with densities much lower than that of silicon oil, sample 3 containing particles with densities slightly lower and slightly higher than that of silicon oil, sample 2 containing particles with densities higher than that of silicon oil and sample 1 containing a mixture of these particles were used. Shear stresses as a function of shear rate were measured for ER fluids in the range of 0-1000 V/mm using a parallel disk type rheometer which was constructed. The shear stress increased with an increase in shear rate for all samples. When ac fields were applied, the shear stress increased in the order of sample 3, sample 4, sample 2 and sample 1. For dc fields,only sample 1 exhibited a high shear stress, while the shear stress of the other samples were similar to that of each other. In addition, the clusters of particles in ER fluids were observed for all samples under ac and dc fields of 1000 V/mm. It was found that the clusters were thin for samples which showed low shear stress.
福山大学の論文